| androgeny | (noun) male parthenogenesis in which the embryo contains only paternal chromosomes due to the failure of the egg nucleus to participate in fertilization | Synonyms: androgenesis |
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| anencephalia | (noun) a defect in brain development resulting in small or missing brain hemispheres | Synonyms: anencephaly |
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| anencephaly | (noun) a defect in brain development resulting in small or missing brain hemispheres | Synonyms: anencephalia |
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| angiogenesis | (noun) the formation of new blood vessels | - |
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| angiotensin | (noun) any of several vasoconstrictor substances (trade name Hypertensin) that cause narrowing of blood vessels | Synonyms: angiotonin, Hypertensin |
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| animateness | (noun) the property of being animated; having animal life as distinguished from plant life | Synonyms: aliveness, liveness |
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| announcement | (noun) a public statement containing information about an event that has happened or is going to happen | Synonyms: promulgation |
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| (noun) a formal public statement | Synonyms: annunciation, declaration, proclamation |
| annulment | (noun) (law) a formal termination (of a relationship or a judicial proceeding etc) | Synonyms: invalidation |
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| (noun) the act of abrogating; an official or legal cancellation | Synonyms: abrogation, repeal |
| (noun) the state of being cancelled or annulled | Synonyms: revocation |
| anointment | (noun) the act of applying oil or an oily liquid | Synonyms: anointing |
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| answerableness | (noun) responsibility to someone or for some activity | Synonyms: accountability, answerability |
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| antecedence | (noun) preceding in time | Synonyms: antecedency, anteriority, precedence, precedency, priority |
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| antecedency | (noun) preceding in time | Synonyms: antecedence, anteriority, precedence, precedency, priority |
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| antecedent | (noun) the referent of an anaphor; a phrase or clause that is referred to by an anaphoric pronoun | - |
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| (noun) a preceding occurrence or cause or event | - |
| (noun) someone from whom you are descended (but usually more remote than a grandparent) | Synonyms: ancestor, ascendant, ascendent, root |
| (noun) anything that precedes something similar in time | Synonyms: forerunner |
| antenna | (noun) one of a pair of mobile appendages on the head of e.g. insects and crustaceans; typically sensitive to touch and taste | Synonyms: feeler |
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| (noun) an electrical device that sends or receives radio or television signals | Synonyms: aerial, transmitting aerial |
| (noun) sensitivity similar to that of a receptor organ | Synonyms: feeler |
| antepenult | (noun) the 3rd syllable of a word counting back from the end | Synonyms: antepenultima, antepenultimate |
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| antepenultima | (noun) the 3rd syllable of a word counting back from the end | Synonyms: antepenult, antepenultimate |
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| antepenultimate | (noun) the 3rd syllable of a word counting back from the end | Synonyms: antepenult, antepenultima |
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| anthropocentricity | (noun) an inclination to evaluate reality exclusively in terms of human values | Synonyms: anthropocentrism |
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| anthropocentrism | (noun) an inclination to evaluate reality exclusively in terms of human values | Synonyms: anthropocentricity |
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| anthropogenesis | (noun) the evolution or genesis of the human race | Synonyms: anthropogeny |
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| anthropogeny | (noun) the evolution or genesis of the human race | Synonyms: anthropogenesis |
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| antiestablishmentarianism | (noun) the doctrine of opposition to the social and political establishment | Synonyms: antiestablishmentism |
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| antiestablishmentism | (noun) the doctrine of opposition to the social and political establishment | Synonyms: antiestablishmentarianism |
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| antiflatulent | (noun) any agent that reduces intestinal gas | - |
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| antigen | (noun) any substance (as a toxin or enzyme) that stimulates an immune response in the body (especially the production of antibodies) | - |
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| antihypertensive | (noun) a drug that reduces high blood pressure | Synonyms: antihypertensive drug |
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| antiqueness | (noun) the quality or state of being in the style or fashion of former times. | - |
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| antivenene | (noun) an antitoxin that counteracts the effects of venom from the bite of a snake or insect or other animal | Synonyms: antivenin |
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| antivenin | (noun) an antitoxin that counteracts the effects of venom from the bite of a snake or insect or other animal | Synonyms: antivenene |
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| apartment | (noun) a suite of rooms usually on one floor of an apartment house | Synonyms: flat |
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| aperient | (noun) a purging medicine; stimulates evacuation of the bowels | Synonyms: cathartic, physic, purgative |
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| apoenzyme | (noun) a protein that combines with a coenzyme to form an active enzyme | - |
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| aposelene | (noun) apoapsis in orbit around the moon | Synonyms: apolune |
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| apparency | (noun) the property of being apparent | Synonyms: apparentness |
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| apparentness | (noun) the property of being apparent | Synonyms: apparency |
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| appeasement | (noun) the act of appeasing (as by acceding to the demands of) | Synonyms: calming |
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| appendage | (noun) a part that is joined to something larger | - |
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| (noun) an external body part that projects from the body | Synonyms: extremity, member |
| (noun) a natural prolongation or projection from a part of an organism either animal or plant | Synonyms: outgrowth, process |
| appendectomy | (noun) surgical removal of the vermiform appendix | Synonyms: appendicectomy |
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| appendicectomy | (noun) surgical removal of the vermiform appendix | Synonyms: appendectomy |
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| appendicitis | (noun) inflammation of the vermiform appendix | - |
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| appendicle | (noun) a small appendage | - |
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| appendicularia | (noun) free-swimming tadpole-shaped pelagic tunicate resembling larvae of other tunicates | - |
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| appendix | (noun) a vestigial process that extends from the lower end of the cecum and that resembles a small pouch | Synonyms: cecal appendage, vermiform appendix, vermiform process |
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| (noun) supplementary material that is collected and appended at the back of a book | - |
| appetence | (noun) a feeling of craving something | Synonyms: appetency, appetite |
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| appetency | (noun) a feeling of craving something | Synonyms: appetence, appetite |
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| appointment | (noun) the act of putting a person into a non-elective position | Synonyms: assignment, designation, naming |
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| (noun) the job to which you are (or hope to be) appointed | - |
| (noun) (law) the act of disposing of property by virtue of the power of appointment | - |
| (noun) (usually in the plural) furnishings and equipment (especially for a ship or hotel) | Synonyms: fitting |
| (noun) a meeting arranged in advance | Synonyms: date, engagement |
| (noun) a person who is appointed to a job or position | Synonyms: appointee |
| apportionment | (noun) the act of distributing by allotting or apportioning; distribution according to a plan | Synonyms: allocation, allotment, apportioning, assignation, parceling, parcelling |
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| appositeness | (noun) appropriateness for the occasion | Synonyms: aptness |
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| appreciativeness | (noun) warm friendly feelings of gratitude | Synonyms: gratefulness, thankfulness |
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| apprehender | (noun) a person who seizes or arrests (especially a person who seizes or arrests in the name of justice) | - |
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| (noun) a person who knows or apprehends | Synonyms: knower |
| apprehension | (noun) the act of apprehending (especially apprehending a criminal) | Synonyms: arrest, catch, collar, pinch, taking into custody |
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| (noun) the cognitive condition of someone who understands | Synonyms: discernment, savvy, understanding |
| (noun) painful expectation | Synonyms: misgiving |
| (noun) fearful expectation or anticipation | Synonyms: apprehensiveness, dread |
| apprehensiveness | (noun) fearful expectation or anticipation | Synonyms: apprehension, dread |
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| apprentice | (noun) works for an expert to learn a trade | Synonyms: learner, prentice |
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| apprenticeship | (noun) the position of apprentice | - |
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| appropriateness | (noun) the quality of being specially suitable | - |
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| (noun) appropriate conduct; doing the right thing | Synonyms: rightness |
| appurtenance | (noun) a supplementary component that improves capability | Synonyms: accessory, add-on, supplement |
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| (noun) equipment consisting of miscellaneous articles needed for a particular operation or sport etc. | Synonyms: gear, paraphernalia |
| arbitrament | (noun) the act of deciding as an arbiter; giving authoritative judgment | Synonyms: arbitration, arbitrement |
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| arbitrement | (noun) the act of deciding as an arbiter; giving authoritative judgment | Synonyms: arbitrament, arbitration |
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| arccotangent | (noun) the inverse function of the cotangent; the angle that has a cotangent equal to a given number | Synonyms: arc cotangent, inverse cotangent |
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| archenteron | (noun) central cavity of the gastrula; becomes the intestinal or digestive cavity | - |
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| arctangent | (noun) the inverse function of the tangent; the angle that has a tangent equal to a given number | Synonyms: arc tangent, arctan, inverse tangent |
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| arena | (noun) a playing field where sports events take place | Synonyms: scene of action |
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| (noun) a large structure for open-air sports or entertainments | Synonyms: bowl, sports stadium, stadium |
| (noun) the central area of an ancient Roman amphitheater where contests and spectacles were held; especially an area that was strewn with sand | - |
| (noun) a particular environment or walk of life | Synonyms: area, domain, field, orbit, sphere |
| arenavirus | (noun) animal viruses belonging to the family Arenaviridae | - |
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| argent | (noun) a metal tincture used in heraldry to give a silvery appearance | - |
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| argentine | (noun) any of various small silver-scaled salmon-like marine fishes | - |
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| argentinosaur | (noun) huge herbivorous dinosaur of Cretaceous found in Argentina | - |
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| argentite | (noun) a valuable silver ore consisting of silver sulfide (Ag2S) | - |
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| argument | (noun) a variable in a logical or mathematical expression whose value determines the dependent variable; if f(x)=y, x is the independent variable | - |
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| (noun) a course of reasoning aimed at demonstrating a truth or falsehood; the methodical process of logical reasoning | Synonyms: argumentation, line, line of reasoning, logical argument |
| (noun) a discussion in which reasons are advanced for and against some proposition or proposal | Synonyms: argumentation, debate |
| (noun) a summary of the subject or plot of a literary work or play or movie | Synonyms: literary argument |
| (noun) a fact or assertion offered as evidence that something is true | Synonyms: statement |
| (noun) a contentious speech act; a dispute where there is strong disagreement | Synonyms: arguing, contention, contestation, controversy, disceptation, disputation, tilt |
| (noun) (computer science) a reference or value that is passed to a function, procedure, subroutine, command, or program | Synonyms: parameter |
| argumentation | (noun) a course of reasoning aimed at demonstrating a truth or falsehood; the methodical process of logical reasoning | Synonyms: argument, line, line of reasoning, logical argument |
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| (noun) a discussion in which reasons are advanced for and against some proposition or proposal | Synonyms: argument, debate |
| armament | (noun) the act of equipping with weapons in preparation for war | Synonyms: arming, equipping |
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| (noun) weaponry used by military or naval force | - |
| armamentarium | (noun) the collection of equipment and methods used in the practice of medicine | - |
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| arpent | (noun) a former French unit of area; equal approximately to an acre | - |
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| arraignment | (noun) a legal document calling someone to court to answer an indictment | - |
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| arrangement | (noun) the act of arranging and adapting a piece of music | Synonyms: arranging, transcription |
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| (noun) the spatial property of the way in which something is placed | Synonyms: placement |
| (noun) an organized structure for arranging or classifying | Synonyms: organisation, organization, system |
| (noun) the thing arranged or agreed to | Synonyms: agreement |
| (noun) a piece of music that has been adapted for performance by a particular set of voices or instruments | Synonyms: musical arrangement |
| (noun) an orderly grouping (of things or persons) considered as a unit; the result of arranging | - |
| arsenal | (noun) a military structure where arms and ammunition and other military equipment are stored and training is given in the use of arms | Synonyms: armory, armoury |
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| (noun) a place where arms are manufactured | Synonyms: armory, armoury |
| (noun) all the weapons and equipment that a country has | Synonyms: armory, armoury |
| arsenate | (noun) a salt or ester of arsenic acid | - |
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| arsenic | (noun) a very poisonous metallic element that has three allotropic forms; arsenic and arsenic compounds are used as herbicides and insecticides and in various alloys; found in arsenopyrite and orpiment and realgar | Synonyms: As, atomic number 33 |
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| (noun) a white powdered poisonous trioxide of arsenic; used in manufacturing glass and as a pesticide (rat poison) and weed killer | Synonyms: arsenic trioxide, arsenous anhydride, arsenous oxide, ratsbane, white arsenic |
| arsenical | (noun) a pesticide or drug containing arsenic | - |
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| arsenide | (noun) a compound of arsenic with a more positive element | - |
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| arsenopyrite | (noun) a silver-white or grey ore of arsenic | Synonyms: mispickel |
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| arthrocentesis | (noun) removal of fluid from a joint by centesis | - |
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| articulateness | (noun) the quality of being facile in speech and writing | Synonyms: fluency, volubility |
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| arytaenoid | (noun) either of two small cartilages at the back of the larynx to which the vocal folds are attached | Synonyms: arytenoid, arytenoid cartilage |
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| arytenoid | (noun) either of two small cartilages at the back of the larynx to which the vocal folds are attached | Synonyms: arytaenoid, arytenoid cartilage |
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| ascendance | (noun) the state that exists when one person or group has power over another | Synonyms: ascendancy, ascendence, ascendency, control, dominance |
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| ascendancy | (noun) the state that exists when one person or group has power over another | Synonyms: ascendance, ascendence, ascendency, control, dominance |
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| ascendant | (noun) someone from whom you are descended (but usually more remote than a grandparent) | Synonyms: ancestor, antecedent, ascendent, root |
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| (noun) position or state of being dominant or in control | Synonyms: ascendent |
| ascendence | (noun) the state that exists when one person or group has power over another | Synonyms: ascendance, ascendancy, ascendency, control, dominance |
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| ascendency | (noun) the state that exists when one person or group has power over another | Synonyms: ascendance, ascendancy, ascendence, control, dominance |
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| ascendent | (noun) someone from whom you are descended (but usually more remote than a grandparent) | Synonyms: ancestor, antecedent, ascendant, root |
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| (noun) position or state of being dominant or in control | Synonyms: ascendant |
| ascender | (noun) (printing) the part of tall lowercase letters that extends above the other lowercase letters | - |
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| (noun) a lowercase letter that has a part extending above other lowercase letters | - |
| (noun) someone who ascends | - |
| ascending | (noun) the act of changing location in an upward direction | Synonyms: ascension, ascent, rise |
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| ascension | (noun) the act of changing location in an upward direction | Synonyms: ascending, ascent, rise |
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| (noun) a movement upward; rise above the ground | Synonyms: ascent, rise, rising |
| (noun) (astronomy) the rising of a star above the horizon | - |
| ascent | (noun) the act of changing location in an upward direction | Synonyms: ascending, ascension, rise |
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| (noun) a movement upward; rise above the ground | Synonyms: ascension, rise, rising |
| (noun) an upward slope or grade (as in a road) | Synonyms: acclivity, climb, raise, rise, upgrade |
| ascolichen | (noun) a lichen in which the fungus component is an ascomycete | - |
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| aspen | (noun) any of several trees of the genus Populus having leaves on flattened stalks so that they flutter in the lightest wind | - |
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| assent | (noun) agreement with a statement or proposal to do something | Synonyms: acquiescence |
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| assenter | (noun) a person who assents | - |
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| assenting | (noun) agreeing with or consenting to (often unwillingly) | Synonyms: accession |
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| assertiveness | (noun) aggressive self-assurance; given to making bold assertions | Synonyms: self-assertiveness |
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